Patent US4711718A successfully refreshed from Google Patents.
US4711718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-selective water filter
Assignee: Sanitech Inc
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Filing: 1987-01-20
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Granted: 1987-12-08
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Expires: 2007-01-20
Abstract
Abstract A filter is disclosed for treating drinking waters contaminated with lead or, alternately, lead and copper. The filter is made an effective extractor of toxic lead or copper by incorporating a particulate chelating agent having substantial selectivity for lead or lead and copper and having little or no reactivity with all other ions.
Inventors
- 👤 Sidney G. Nelson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:28
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; C02F1/001; C02F1/003; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; C02F2307/00; C02F2307/06; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
A device for removing dissolved lead and copper ions from drinking water consisting of a vessel that attaches to the outlet section of a water dispensing faucet; a bed containing catechol siderophore modified by substituting bromine, chloride or nitrogen oxide in the benzene ring of the catechol that selectively removes and absorbs lead and copper ions from waters passing through it; and porous support means for holding said bed in place in said vessel and for allowing water to flow through the bed.
Claim 2
Independent Claim
83 words
A device for removing dissolved lead and copper ions from drinking water consisting of a vessel that attaches to the outlet section of a water dispensing faucet; a bed containing catechol siderophore modified by substituting bromine, chloride or nitrogen oxide in the benzene ring of the catechol that selectively removes and absorbs lead and copper ions from waters passing through it; and porous support means for holding said bed in place in said vessel and for allowing water to flow through the bed.
Claim 3
Independent Claim
107 words
A device for removing dissolved lead and copper ions from drinking water consisting of a containing vessel that attaches to the outlet section of a water dispensing faucet; a granular bed of catechol siderophore modified by substituting bromine, chloride or nitrogen oxide in the benzene ring of the catechol and chemically attached to silica particles that selectively removes and absorbs lead and copper ions from water when water is passed through said bed; and separate top and bottom porous support means for holding said filter bed in place in said containing vessel and allowing said drinking water to pass through said filter bed and exit said device.
Claim 4
Independent Claim
107 words
A device for removing dissolved lead and copper ions from drinking water consisting of a containing vessel that attaches to the outlet section of a water dispensing faucet; a granular bed of catechol siderophore modified by substituting bromine, chloride or nitrogen oxide in the benzene ring of the catechol and chemically attached to silica particles that selectively removes and absorbs lead and copper ions from water when water is passed through said bed; and separate top and bottom porous support means for holding said filter bed in place in said containing vessel and allowing said drinking water to pass through said filter bed and exit said device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |